﻿using System;
using System.Security.Cryptography;
using System.Text;

namespace Qiao.Common.Core.加密
{
    public class DesSecurity
    {
        private static string key = "FGYLFGYL";

        #region 字符串加密
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static string EncryptAsc(string source)
        {
            return DESEncrypt(source, key);
        }
        #endregion

        #region 字符串解密
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static string UnEncryptAsc(string source)
        {
            return DESDecrypt(source, key);
        }
        #endregion

        #region DESEncrypt DES加密
        // <summary>
        /// 进行DES加密。
        /// </summary>
        /// <param name="pToEncrypt">要加密的字符串。</param>
        /// <param name="sKey">密钥，且必须为8位。</param>
        /// <returns>以Base64格式返回的加密字符串。</returns>
        private static string DESEncrypt(string pToEncrypt, string sKey)
        {
            if (string.IsNullOrEmpty(pToEncrypt))
                return string.Empty;

            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Convert.ToBase64String(ms.ToArray());
                ms.Close();
                return str;
            }
        }
        #endregion

        #region DESDecrypt DES解密
        /// <summary>
        /// 进行DES解密。
        /// </summary>
        /// <param name="pToDecrypt">要解密的以Base64</param>
        /// <param name="sKey">密钥，且必须为8位。</param>
        /// <returns>已解密的字符串。</returns>
        private static string DESDecrypt(string pToDecrypt, string sKey)
        {
            if (string.IsNullOrEmpty(pToDecrypt))
                return string.Empty;

            byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            }
        }
        #endregion
    }
}

